Question: Resistor earthed 15MVA, 11kV DG is protected by an IDMT relay connected to a 100:1 A/A CT mounted in the neutral conductor. Establish a

Resistor earthed 15MVA, 11kV DG is protected by an IDMT relay connected

Resistor earthed 15MVA, 11kV DG is protected by an IDMT relay connected to a 100:1 A/A CT mounted in the neutral conductor. Establish a current relay setting which will cover 93 % of the generator stator winding against earth faults. Assume that earthing resistor R should limit the earth fault current on the generator terminals to 90% of its nominal current. 50N 51N Available relay settings: I, (0.08 4.0) in steps of 0.01/ [0.49 A (-1A) R

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